JPH0730277Y2 - Shot peening equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a shot peening apparatus.

[Prior Art] Solid particles (shot particles) formed of an appropriate material are projected onto a metal work surface to increase the residual compressive stress on the work surface, thereby increasing the strength (hardness) of the work surface. The shot peening apparatus described above is conventionally known.

Generally, such a shot peening apparatus includes a work holding unit that holds a work rotatably with its surface exposed to the outside, and an impeller that projects shot particles toward the work held by the work holding unit. And a shot particle collecting device for collecting shot particles that have fallen after projection and returning them to the impeller.

In such a conventional shot peening machine,
After setting the work on the work holding part, while rotating the work, the shot particles are uniformly projected from the impeller onto the work surface to generate a predetermined residual compressive stress on the work surface, and then the work is removed from the work holding part. Is being repeated.

Then, in order to generate a predetermined residual compressive stress on the work surface by shot peening, it is necessary to make a certain amount of shot particles collide with the work surface. Therefore, in the conventional shot peening apparatus, the shot grain projection time from the impeller to the work is made constant, and the effect of shot peening (residual compressive stress) is made constant.

[Problems to be solved by the invention] By the way, shot particles that have fallen after being projected from the impeller are returned to the impeller by a shot particle recovery device, but since the shot particles are solid particles, they are continuous (automatically).
It is difficult to perform such transportation, and sometimes the shot particles are accumulated or clogged in the shot particle collecting device. Therefore, the amount of shot particles returned to the impeller fluctuates, and accordingly, the amount of shot particles projected on the impeller also fluctuates. Further, in the conventional shot peening apparatus, since shot peening is stopped when projection of shot particles is performed for a certain period of time, there is a problem that sufficient shot peening may not be performed on the work surface due to variation in projection amount of shot particles There is.

The present invention has been made in view of the above conventional problems, and can reliably perform predetermined shot peening even if the amount of shot particles collected or the amount of shot particles projected fluctuates. It is an object of the present invention to provide a shot peening apparatus capable of sufficiently increasing the strength of the.

[Means for Solving the Problems] The inventors of the present application conducted a detailed study on the projection characteristics of shot particles from an impeller of a shot peening apparatus,
We discovered the fact that the shot grain distribution densities were almost equal at positions that were approximately equidistant from the impeller within the shot grain projection area. Therefore, if some kind of shot grain collecting means is provided at a position where the distance from the impeller is almost equal to the work surface in the shot grain projection area, the shot grain collecting amount by this is proportional to the shot grain collision amount on the work surface. Therefore, it was thought that the shot grain collision amount on the work surface could be grasped from the shot grain recovery amount.

In view of such facts and ideas, the present invention is provided with a work holding portion that exposes and holds a work to the outside, and an impeller that projects shot particles toward the work held by the work holding portion. A shot peening apparatus, which is a shot grain collection chamber having an opening that opens into a shot grain projection area of an impeller, and a shot grain storage chamber formed downstream of the shot grain collection chamber and communicating with the shot grain collection chamber. And a shot grain discharging means capable of discharging the shot grains stored in the shot grain storage chamber at any time, and shot from the opening while the shot grains are projected such that a predetermined shot peening is performed on the work. Storage state detecting means for detecting whether or not shot grains corresponding to the virtual shot grain amount entering the grain collection chamber are stored in the shot grain storage; When the state detection means detects that the shot grain storage amount has reached the virtual shot grain amount, a shot that causes the impeller to stop shot grain projection and causes the shot grain discharging means to discharge shot grains in the shot grain storage chamber. Provided is a shot peening apparatus, which is provided with a control means.

[Advantage and Effect of the Invention] According to the present invention, when the shot particles are projected onto the work, the amount of the shot particles that collide with the surface of the work is approximately proportional to the amount of the shot particles that enter the shot particle recovery chamber through the opening.
Then, based on such a proportional relationship, when the shot grain corresponding to the virtual shot grain amount capable of performing the predetermined shot peening on the work surface is stored in the shot grain storage chamber, the shot control unit shots the impeller. Since the grain projection is stopped and the shot peening is finished, a predetermined shot peening is surely performed on the work surface at the end of the shot peening. Therefore, even when the shot grain projection amount fluctuates due to delays in the collection of shot grains to the impeller, the work is stably subjected to predetermined shot peening, and the work surface strength is sufficiently increased. To be

Also, when each shot peening is finished,
Since shot particles in the shot particle storage chamber are automatically discharged by the shot control means, workability of shot peening can be improved.

[Examples] Examples of the present invention will be specifically described below.

As shown in FIG. 1, the shot peening apparatus SP substantially includes a work holding part A for holding a plurality of cylindrical metal works 1 in a stack and a metal shot grain on the outer peripheral surface of the work 1. And an impeller 2 that collects shot particles that have fallen after the projection and returns them to the impeller 2 (not shown).

Although not shown in detail, the impeller 2 is an ordinary shot grain projector, and is adapted to project shot grains by utilizing centrifugal force. In the shot grain projection area 3, the shot grain distribution densities are substantially equal at positions where the distance from the impeller 2 is substantially equal.

The support member 5 is attached to the work holding portion A via the bearing 4.
A turntable 6 is provided which is rotatably supported by. A driven gear 7 (bevel gear) is attached to a lower end portion of the turntable 6, and the driven gear 7 meshes with a drive gear 9 (bevel gear) attached to a rotary shaft 8. The rotary shaft 8 is rotationally driven by a motor (not shown), and this rotation is transmitted to the turntable 6 via the drive gear 9 and the driven gear 7.

A jig 11 for holding the work 1 is provided on the upper surface of the turntable 6. A plurality of cylindrical works 1 are stacked and set on the jig 11. And
A rotation stopper member 12 is screwed into the male screw portion formed on the outer peripheral surface of the jig 11 slightly below the upper end portion.
Is rotated around the insertion line, the stacked works 1 can be pressed in the stacking direction to fix the posture.

When the turntable 6 rotates, the work 1 set on the jig 11 also rotates, and the shot particles projected from the impeller 2 collide evenly with the outer peripheral surface of the work 1.

Inside the jig 11, there is a shot grain recovery chamber of a substantially cylindrical shape.
15 are formed, and a plurality of openings 14 that open to the shot grain projection area 3 are formed on the side surface near the upper end of the shot grain collection chamber 15. When these openings 14 are located on the impeller 2 side as the turntable 6 rotates, the distance of the openings 14 from the impeller 2 becomes substantially equal to the distance of each work 1 from the impeller 2. There is. Therefore, at the position facing the impeller 2,
The distribution density of shot particles at the time of shot particle projection becomes substantially equal on the surface of the work 1 and the opening 14, and therefore,
The amount of shot particles that collide with the surface of the work 1 and the amount of shot particles that enter the shot particle recovery chamber 15 through the opening 14 are substantially proportional. That is, the amount of shot particles that have collided with the work 1 can be grasped from the amount of shot particles that have entered the shot particle recovery chamber 15 through the opening 14.

A shot grain storage chamber 16 is provided in the axial center of the turntable 6 below the shot grain collection chamber 15 so as to communicate with the shot grain collection chamber 15. The lower end of the shot grain storage chamber 16 opens at the lower end surface of the turntable 6,
This opening is opened and closed by an on-off valve 18. A cylinder member 17 is provided for the on-off valve 18, and the cylinder member 17 is responsive to a signal from the controller 23.
The opening / closing valve 18 is driven to open / close via the shaft portion 19. Here, the on-off valve 18 is connected to the shaft portion via the bearing 20.
The on-off valve 18 and the shaft portion 19 are in slidable contact with each other even if the on-off valve 18 rotates with the turntable 6 while being in contact with the turntable 6. The on-off valve 18 and the shaft portion 19 are made of a conductive material. The on-off valve 18 and the cylinder member 17 correspond to the shot grain discharging means described in claim 1 of the present application.

Electric contact on the positive side at a predetermined position in the shot grain storage chamber 16
21 are provided. The positive-side electrical contact 21 is provided from the opening 14 to the shot-grain collection chamber 16 while the shot-grain storage chamber 16 below the positive-side electrical contact 21 is projected with shot grains such that the work 1 is subjected to predetermined shot peening. It is arranged at a position where it can store shot grains equivalent to the virtual shot grain amount within 15.

The positive side electrical contact 21 is electrically connected to the positive power source 22. On the other hand, the shaft portion 19 of the cylinder member 17 is connected to the minus power source 24. Here, since the negative power source 24, the shaft portion 19, the on-off valve 18, and the shot particles in the shot particle storage chamber 16 are all formed of a conductive material,
It is electrically connected. Therefore, when the shot particles in the shot particle storage chamber 16 reach the positive side electrical contact 21, the positive power source 22 is electrically connected to the negative power source 24 and a current flows, and this current flows through the sensor unit ( (Not shown), the shot grain projection of the impeller 2 is stopped by the controller 23 at this time. The plus-side electric contact 21 and the controller 23 correspond to the storage state detecting means and the shot control means described in claim 1 of the present application, respectively.

As described above, the shot grain amount in the shot grain storage chamber 16 below the positive side electrical contact 21 corresponds to the virtual shot grain amount capable of performing the predetermined shot peening on the surface of the work 1. , Where work 1
The surface is surely given a predetermined shot peening.
Therefore, the predetermined shot peening is stably applied to the work 1 even when the shot grain projection amount of the impeller 2 changes.

When the controller 23 opens the opening / closing valve 18 via the cylinder member 17, the shot particles in the shot particle storage chamber 16 are discharged.

The operation of the shot peening apparatus SP will be described below with reference to the cycle diagram shown in FIG.

Rotation of the index is stopped at time t _1, the process is started.

Following this, at time t ₂ , the cylinder member 17 rises, the on-off valve 18 is closed, and the lower opening of the shot grain storage chamber 16 is closed.

Immediately thereafter, at time t ₃ , the turntable 6 starts to rotate, and along with this, the work 1 also starts to rotate, and at the same time, projection of shot particles from the impeller 2 is started, and shot peening is started.

Then, when the upper end surface of the shot particles in the shot particle storage chamber 16 reaches the plus-side electric contact 21, the plus-side electric contact 21, the shot particles, the on-off valve 18, and the shaft portion are sequentially provided from the plus power source 22.
An electric current flows through the negative power source 24 via 19 and. This current is detected by the sensor unit in the controller 23 (time t ₄ ),
Immediately after this, at time t ₅ , the rotation of the turntable 6 is stopped and the shot grain projection of the impeller 2 is stopped.

Subsequently, at time t ₆ , the shot member 17 descends, the opening / closing valve 18 is opened accordingly, and the shot particles in the shot particle storage chamber 16 are discharged. Then, at time t ₇ , the index starts to rotate, and this processing ends.

[Brief description of drawings]

FIG. 1 is an elevational sectional view of a shot peening machine showing an embodiment of the present invention. FIG. 2 is a cycle diagram of the shot peening apparatus shown in FIG. SP: Shot peening machine, 1 ... Work, 2 ...
Invera, 3 ... Shot grain projection area, 6 ... Turntable, 11 ... Jig, 12 ... Rotation stop member, 14 ... Opening part, 15 ... Shot grain collection chamber, 16 ... Shot grain storage chamber , 17 …… Cylinder member, 21 …… Positive side electrical contact, 22
…… Positive power supply, 23 …… Controller, 24 …… Minus power supply.

Claims (1)

[Scope of utility model registration request] 1. A shot peening apparatus provided with a work holding part for exposing and holding a work to the outside, and an impeller for projecting shot particles toward the work held by the work holding part. A shot grain collection chamber having an opening that opens into the shot grain projection area, a shot grain storage chamber formed in communication with the shot grain collection chamber on the downstream side of the shot grain collection chamber, and a shot grain storage chamber Shot grain discharging means capable of discharging shot grains at any time, and the virtual shot grain amount entering the shot grain collecting chamber from the opening while the shot grains are projected such that the work is subjected to predetermined shot peening. And a storage state detecting means for detecting whether or not the shot grains corresponding to the above are stored in the shot grain storage chamber. When it is detected that the storage amount of the shot particles reaches the virtual shot particle amount, a shot control means for stopping the shot particle projection on the impeller and discharging the shot particles in the shot particle storage chamber to the shot particle discharging means is provided. A shot peening device characterized by being provided.